diff --git a/src/osg/MatrixTransform.cpp b/src/osg/MatrixTransform.cpp
index 79de87ce5..4cff1972d 100644
--- a/src/osg/MatrixTransform.cpp
+++ b/src/osg/MatrixTransform.cpp
@@ -32,7 +32,7 @@ MatrixTransform::MatrixTransform(const Matrix& mat )
     _referenceFrame = RELATIVE_RF;
 
     _matrix = mat;
-    _inverseDirty = false;
+    _inverseDirty = true;
 }